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From the open(1) man page:
-W Causes open to wait until the applications it opens (or that were
already open) have exited. Use with the -n flag to allow open to
function as an appropriate app for the $EDITOR environment variable.

I've asked myself the very same question many times, but the -W switch must be new in 10.5. On 10.4.11, there's no mention of -W in the open(1) man page, and neither does the command itself seem to recognize the switch.